Purchased the $9.99/month plan which includes photoshop and lightroom. I have no issues when using photoshop, however, lightroom is asking for a serial number that was not sent to me. I've checked my email, as well as my account with no success. I need help as soon as possible as I am on a timed basis to edit photos and this has become an inconvenience to the process. Thanks.
Welcome to Adobe Forum,
If you have any beta(Trial) version of Light Room installed, then please uninstall it completely by checking the preference boxes.
Once it has been uninstalled, you can try installing the Lightroom from the CC Desk top App.